According to the article from the Caecilia which gives the history of the Missa De Angelis (VIII), there exist tropes for the Kyrie. After explaining that the name of the Mass is not based on any trope, it says:

"This is not due to the lack of tropes written to this music: years ago, Dom Pothier published a trope set to this chant, one which was not, however, in very general use. At any rate, it probably has been included only in the old Gradual of the diocese of Toul, France (which diocese is now divided in two parts, one part having been added to the diocese of Nancy, the other, to the diocese of Saint-Die.)"

If anyone could help me find images of these tropes, I would be much obliged. I know neither where Dom Pothier's publications are to be found, nor nor where Toul's Graduale is, but perhaps someone here does.